Plug-mounted background noise amplifier enclosure



FIG. 1 is a top plan view of a plug-mounted, background noise amplifier enclosure showing our new design with part of the top wall broken away;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a bottom plan view;

FIG. 5 is a left side elevational view; and

FIG. 6 is a right side elevational view. 

The ornamental design for plug-mounted background noise amplifier enclosure, as shown and described. 